title: Recognition mechanism of water-compatible molecularly imprinted solid-phase extraction and determination of nine quinolones in urine by high performance liquid chromatography.
abstract: Novel water-compatible molecularly imprinted polymers (MIPs) were synthesized in methanol-water systems with ofloxacin as templates and methacryclic acid as functional monomers. The MIPs were used as a special sorbent for the selective solid-phase extraction (SPE) of nine quinolones from urine samples, showing high affinity to the quinolones in aqueous environment. Its molecular recognition mechanisms were investigated by the molecular simulation and the experimental validation with UV and infrared spectrogram as well as (1)H NMR. Binding capability and chromatographic characteristic were also evaluated. By using the water-compatible MIPs as SPE sorbents, the nine quinolones can be selectively extracted and enriched, while all matrices interferences were eliminated simultaneously. Under the optimal conditions of SPE and high performance liquid chromatography (HPLC), the good linearity of the method was obtained in a range of 0.05-30microg/mL with the correlation coefficient of >0.999 and the relative standard division of 2.0-7.4%. The detection limits (s/n=3) were in a range of 0.036-0.10microg/mL. The proposed method was successfully applied for the selective extraction and separation of the studied quinolones in urine samples.
authors.affiliation: College of Chemical and Environmental Sciences, Hebei University, Key Laboratory of Analytical Science and Technology of Hebei Province, Baoding 071002, China. hanwei@hbu.edu.cn
authors.forename: Han-wen
authors.initials: HW
authors.lastname: Sun
authors.forename: Feng-xia
authors.initials: FX
authors.lastname: Qiao
mesh_terms: D001665:Binding Sites; D002851:Chromatography, High Pressure Liquid; D003198:Computer Simulation; D006801:Humans; D006860:Hydrogen Bonding; D006863:Hydrogen-Ion Concentration; D008689:Methacrylates / Q000138:chemical synthesis / Q000737:chemistry; D008958:Models, Molecular; D015242:Ofloxacin / Q000138:chemical synthesis* / Q000737:chemistry; D011108:Polymers / Q000138:chemical synthesis* / Q000737:chemistry; D015363:Quinolones / Q000737:chemistry / Q000652:urine*; D015203:Reproducibility of Results; D012680:Sensitivity and Specificity; D052616:Solid Phase Extraction / Q000379:methods*; D012997:Solvents / Q000737:chemistry; D014867:Water / Q000737:chemistry
chemical_list: D008689:Methacrylates; D011108:Polymers; D015363:Quinolones; D012997:Solvents; D014867:Water; C008384:methacrylic acid; D015242:Ofloxacin